HdyDemoWindow: Don't schedule arrow redraws

It's handled by the class itself.
13 jobs for arrows-cleanup in 15 minutes and 44 seconds (queued for 27 seconds)
Status Job ID Name Coverage
  Build
passed #29356
librem5
build-debian-clang

00:02:34

passed #29362
librem5
build-debian-gcc

00:02:18

passed #29363
librem5
build-debian-gcc-static

00:01:28

passed #29364
librem5
build-debian-package

00:01:47

passed #29367
librem5
build-fedora-gcc

00:03:33

failed #29348
librem5
build-debian-clang

00:00:01

failed #29338
librem5
build-debian-clang

00:00:44

failed #29336
librem5
build-debian-gcc

00:01:16

failed #29337
librem5
build-debian-gcc-static

00:00:45

failed #29340
librem5
build-debian-package

00:00:45

failed #29339
librem5
build-fedora-gcc

00:00:54

 
  Docs
passed #29341
librem5
build-gtkdoc

00:01:35

 
  Test
passed #29342
librem5
unit-test

00:02:49

39.0%